Additional track

via StreetComplete 31.2

Attached photo(s):
https://westnordost.de/p/37177.jpg

This section of road (north of the railway track, and south of the A270 Old Shoreham Road) is called Carlton Terrace (B2194), NOT Station Road.

Is this a separate school building?

Mill House pub has been demolished and replaced by housing.

This looks more like a school than next door.

Acorn Nursery
www.brighton-hove.gov.uk/acornnursery

Wrong turn:
This isn’t an exit off this section of dual carriageway.
App tells you to make a exit which is dangerous and impossible.

"This stop has been relocated further west before the road junction travelling eastwards"
The place has gone or never existed. This is an auto-generated note from MAPS.ME application: a user reports a POI that is visible on a map (which can be outdated), but cannot be found on the ground.
POI name: Kingston Lane
POI types: highway-bus_stop
OSM data version: 2017-05-11T13:22:09Z
#mapsme

This is listed as The Wistleton Inn. There used to be a Whistlestop Inn "opposite" Portslade Station, which has (though possibly back in Dec. 2015!) been refurbished, and is now The Railway Inn "2 Boundary Rd BN41 1GA". The fact that, on this map, Boundary Rd fuses with Stn. Rd further south, and that Victoria Rd is an obvious point where the streetname-change might actually happen, PLUS the location right by a junction, consistent with its being No.2, might suggest a few slight errors. I'm not a local: someone who uses The Railway as a music venue gave me this info.

Unable to answer "What is the name of this pedestrian street?" for https://osm.org/way/239051488 via StreetComplete 31.3:

change to service Rd. no name.